The breakdown characteristic of Al2O3/PI by light transmittance

Inorganic nanohybrid polyimide (PI) film has great potential for applications in the areas of electrics and electronics because of its excellent electrical performance, such as the resistance to aging and corona and so on. The breakdown strength of insulating materials is generally measured by DC, AC or impulse voltage. However, the influence of laser irradiation to Al₂O₃/ PI film has not been reported so far. In this paper, the Al₂O₃/ PI film with different Al₂O₃ component is irradiated by semiconductor laser, and the output power is 100 mW. The influences of some factors (such as the distance of sample and laser, irradiation time) on luminousness have been studied. The experimental results show that the light transmittance of the films and the size of the breakdown hole are affected by the Al₂O₃ component in films. In this paper, the relationship between breakdown performance and light transmittance is researched and the method of the breakdown performance of Al₂O₃/ PI film represented by light transmittance is also investigated.